US 12,270,327 B2
Exhaust gas purification catalyst apparatus
Kana Iwata, Kakegawa (JP); Minoru Itou, Kakegawa (JP); Takeru Yoshida, Toyota (JP); Masaru Kakinohana, Toyota (JP); Hiromasa Suzuki, Toyota (JP); and Atsushi Tanaka, Toyota (JP)
Assigned to CATALER CORPORATION, Kakegawa (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Appl. No. 17/620,806
Filed by CATALER CORPORATION, Kakegawa (JP); and TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
PCT Filed Jun. 17, 2020, PCT No. PCT/JP2020/023843
§ 371(c)(1), (2) Date Dec. 20, 2021,
PCT Pub. No. WO2020/262173, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 2019-118961 (JP), filed on Jun. 26, 2019.
Prior Publication US 2022/0412244 A1, Dec. 29, 2022
Int. Cl. F01N 3/28 (2006.01); B01J 21/04 (2006.01); B01J 23/63 (2006.01); B01J 35/56 (2024.01)
CPC F01N 3/2828 (2013.01) [B01J 21/04 (2013.01); B01J 23/63 (2013.01); B01J 35/56 (2024.01); F01N 2330/06 (2013.01); F01N 2330/30 (2013.01); F01N 2370/02 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An exhaust gas purification catalyst apparatus comprising a honeycomb substrate and one or more catalyst noble metals supported by the honeycomb substrate, wherein
the honeycomb substrate has a plurality of cells partitioned by a porous partition wall,
the porous partition wall contains ceria-zirconia composite oxide particles as a constituent material,
the plurality of cells comprise:
an inlet side cell which is open on an upstream side of an exhaust gas flow and sealed on a downstream side thereof, and
an outlet side cell which is sealed on the upstream side of the exhaust gas flow and open on the downstream side thereof, and
are thereby configured to allow an exhaust gas flowed into the inlet side cell to pass through the porous partition wall and discharge from the outlet side cell,
the catalyst noble metal is supported in an inlet side support region and an outlet side support region of the porous partition wall,
the inlet side support region:
is present in a length of more than 80% and 100% or less of a total length of the honeycomb substrate from an exhaust gas flow upstream end of the inlet side cell, and
when an amount of the catalyst noble metal supported in the inlet side support region is accumulated in a depth direction from an inlet side surface of the porous partition wall, a depth up to which 70% of the catalyst noble metal supported in the inlet side support region is supported is less than 20% of the thickness of the porous partition wall, and
the outlet side support region:
is present in a length of 5% or more and 50% or less of the total length of the honeycomb substrate from an exhaust gas flow downstream end of the outlet side cell, and
when an amount of the catalyst noble metal supported in the outlet side support region is accumulated in the depth direction from an outlet side surface of the porous partition wall, a depth up to which 70% of the catalyst noble metal supported in the outlet side support region is supported is more than 50% of the thickness of the porous partition wall.